5.3. Check of functioning of system of ignition

Because in system of ignition high voltage is developed, it is necessary to take measures of extreme care what works would not be performed with ignition components. It concerns not only the sensor of impulses (electronic ignition), the coil of ignition, the distributor and high-voltage wires of spark plugs, but also related such components as tips of spark plugs, a tachometer and other test equipment.


  1. If the engine is turned, but not started, disconnect a high-voltage wire from any spark plug and connect it to a sparking tester (available in most shops of autoaccessories).

There are two various types of testers of sparking. Make sure that your tester is suitable for electronic (contactless) ignition. Connect a tester clip to a case element like a metal arm.

  1. If the tester of sparking is absent, then disconnect from one of spark plugs. The isolated tool hold a wire approximately in six millimeters from the block of cylinders - be convinced that the gap does not exceed six millimeters, otherwise electronic components can fail.
  2. Turn a starter the engine and observe sparking on the end of a tester or the end of a high-voltage wire. If there is dark blue well distinguishable spark, then on candles tension, sufficient for fuel ignition, moves. However, candles can be faulty therefore remove them and check how Routine maintenance of the car is described in the Head.
  3. If sparking does not happen, check in the same way other high-voltage wire. Irregular sparking corresponds to its absence.
  4. If sparking does not happen, uncover the distributor of ignition and check a cover and the runner as Routine maintenance of the car is described in the Head. If moisture is found, then for drainage of a cover and the runner use the moisture absorbing aerosol (or something similar), then establish a cover and repeat the test of sparking.
  5. If sparking after all does not happen, disconnect a high-voltage wire of the coil of ignition from a distributor cover and check this wire as it is described for wires of spark plugs.
  6. If sparking does not happen, check contacts of primary chain of the coil of ignition to be convinced of their purity and reliability. Make necessary repair, then repeat check.
  7. If sparking through a high-voltage wire of the coil of ignition happens, then the distributor cover, the runner, a high-voltage wire(s) of spark plugs or a candle (candles) of ignition can be faulty. If sparking nevertheless does not happen, there can be faulty a high-voltage wire from the ignition coil to a distributor cover. If replacement of a wire does not change a situation, then check the ignition coil (look the Section Check and replacement of the coil of ignition).

Concerning carrying out other tests of distributors of ignition of the TCI systems address the Sections Check and replacement of the sensor of impulses and the block of control of ignition (TCI system) and Check and adjustment of an air gap (TCI system).